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Synovial processes in rheumatoid arthritis.

H G Fassbender1, S Gay

  • 1Zentrum für Rheuma-Pathologie (WHO Centre), Mainz, FRG.

Scandinavian Journal of Rheumatology. Supplement
|January 1, 1988
PubMed
Summary

Rheumatoid arthritis (RA) involves joint destruction via immature synoviogenous cell masses, not inflammation. These masses exhibit oncological analogies, differing from typical inflammatory processes in RA.

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Area of Science:

  • Rheumatology
  • Oncology
  • Cell Biology

Background:

  • Rheumatoid arthritis (RA) is a systemic autoimmune disease characterized by inflammation and progressive joint destruction.
  • The precise mechanisms driving joint destruction in RA, beyond inflammation, remain incompletely understood.
  • Previous research has focused on inflammatory mediators, but the role of specific cell behaviors in RA pathogenesis warrants further investigation.

Purpose of the Study:

  • To elucidate the cellular mechanisms underlying joint destruction in rheumatoid arthritis (RA).
  • To investigate the nature and behavior of specific cell masses observed in the synovial membrane of RA patients.
  • To explore potential oncological analogies in the cellular processes driving RA-associated joint damage.

Main Methods:

  • Analysis of joint tissues from approximately 14,500 patients with defined rheumatoid arthritis (RA).
  • Histopathological examination to identify and characterize cell masses in the synovial membrane.
  • Evaluation of cellular composition, including the presence or absence of inflammatory cells (lymphocytes, plasma cells, PMNs, macrophages).
  • Assessment of cell growth characteristics, vascularization, and modulation to fibroblasts.
  • Investigation of gene expression, specifically focusing on myc and ras oncogenes in aggressive cell masses.

Main Results:

  • Compact, homogeneous cell masses composed of immature, macronuclear synoviogenous cells were identified in the synovial membrane following exudative episodes.
  • These cell masses demonstrated aggressive encroachment on articular cartilage and subchondral bone, leading to enzymatic degradation and destruction.
  • The aggressive cell masses were avascular, leading to their collapse, with surviving cells modulating into fibroblasts and initiating collagen synthesis to form pannus.
  • Notably, inflammatory cells such as lymphocytes, plasma cells, PMNs, and macrophages were absent in the compact cell masses but appeared after their breakdown and pannus formation.
  • High expression of myc and ras oncogenes was detected in these aggressive cell masses, suggesting oncological analogies.

Conclusions:

  • The joint destruction in RA is driven by immature synoviogenous cell masses with non-inflammatory, oncological characteristics, distinct from initial synovitis.
  • These aggressive cell masses precede pannus formation and are responsible for the enzymatic degradation of cartilage and bone.
  • The findings suggest a novel paradigm for understanding RA pathogenesis, highlighting cellular behavior and oncogene expression as critical factors in joint destruction.

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